How do I create a new Team (on Microsoft Teams)?
Creating a new Microsoft Team
How do I create a new team?
Click Teams 
From there, you can invite people or even entire contact groups (aka "distribution lists") to join your team.
If you already have an O365 Group (aka "distribution list"), you should consider creating your Team from the existing group. Please see the Microsoft article, Create a team from an existing group.
Now that you have a new team, why not add some new channels for specific conversation topics? Or even invite guests from outside your organization to help with a project?
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